You are seeing two different things:
1) UIL2 uses a thread pool.
This thread pool is not being shutdown when you close the connection
so you have to wait 60 seconds for the threadpool itself to reap
the threads or more probably at garbage collection.
This is a bug, I will fix it.
2) If you use the default stacksize on Linux (8M) you'll find
you can't create very many threads.
This will show up as an OutOfMemoryException.
Dropping the stack size will allow you create
many more threads. Alter the ulimit command in run.sh
8M is a bit much for java which allocates most memory on the heap.
P.S. Opening and closing connections for every send isn't
very efficient. :-)
It is much more efficient to share one connection and use
multiple sessions or use a pool of already open connections/sessions.
Regards,
Adrian
On Fri, 2003-12-19 at 09:05, Didi Posselt wrote:
> Hi folks,
>
> If I create QueueConnections with a UIL2ConnectionFactory, a new thread
> seems to be generated for this QueueConnection. However, if I close this
> QueueConnection, the thread seems to live for another minute or so.
>
> I'm running a linux box with JDK-1.4.2 and JBoss-3.2.3RC1.
>
> I guess this is due to the PingPeriod of 60000 in uil2-service.xml, however,
> since I close the QueueConnection I expect the thread to disappear
> immediately.
>
> I wrote a stand alone graphical tool to manage our jms queues and messages
> on the server. I got OutOfMemory-failures on the server pretty often and I
> quess this is bound to the extra threads since sometimes I create
> QueueConnections for any message in the queue (e.g. to resend messages
> from the DLQ to the original destination, which might be different for the
> messages).
>
> I wrote a small example application which easily shows the bug (or is this a
> feature?).
>
> posselt in pingu (164) [0] > cat UIL2Bug.java
> import java.util.Properties;
>
> import javax.naming.InitialContext;
>
> import javax.jms.QueueConnection;
> import javax.jms.QueueConnectionFactory;
>
> public class UIL2Bug {
>
>
> public static void main(String args[]) {
> Properties properties;
> InitialContext jndiContext;
> QueueConnectionFactory queueFactory;
> QueueConnection queueConnection;
> int i;
>
> queueConnection = null;
>
> if (args.length!=1) {
> System.out.println("USAGE: java UIL2Bug <jndi-url>");
> System.exit(-1);
> }
>
> properties = new Properties();
> properties.setProperty("java.naming.factory.initial",
> "org.jnp.interfaces.NamingContextFactory");
> properties.setProperty("java.naming.provider.url", args[0]);
>
> try {
> jndiContext = new InitialContext(properties);
>
> queueFactory = (QueueConnectionFactory)
> jndiContext.lookup("UIL2ConnectionFactory");
>
> for (i=0; i<500; i++) {
> queueConnection = queueFactory.createQueueConnection();
> queueConnection.close();
> queueConnection = null;
> }
>
> } catch (Exception ex) {
> System.out.println("Exception while browsing the queue: " +
> ex.getMessage());
> }
>
> if (queueConnection!=null) {
> try {
> queueConnection.close();
> } catch (Exception ex) {
> System.out.println("Warning: Exception while closing
> queueConnection: " + ex.getMessage());
> }
> }
> }
>
>
> }
> posselt in pingu (165) [0] > setenv CLASSPATH
> ${HOME}/jboss/jboss-src/jboss-3.2.3RC1-src/build/output/jboss-3.2.3RC1/client/jbossall-client.jar:.
> posselt in pingu (166) [0] > javac UIL2Bug.java
> posselt in pingu (167) [0] > echo -n "TIME: `date +'%H:%M:%S'` THREADS: " ;
> ps -ef | grep org.jboss | wc -l
> TIME: 09:54:51 THREADS: 100
> posselt in pingu (168) [0] > java UIL2Bug localhost:1099
> posselt in pingu (169) [0] > echo -n "TIME: `date +'%H:%M:%S'` THREADS: " ;
> ps -ef | grep org.jboss | wc -l
> TIME: 09:55:04 THREADS: 673
> posselt in pingu (170) [0] > echo -n "TIME: `date +'%H:%M:%S'` THREADS: " ;
> ps -ef | grep org.jboss | wc -l
> TIME: 09:55:50 THREADS: 674
> posselt in pingu (171) [0] > echo -n "TIME: `date +'%H:%M:%S'` THREADS: " ;
> ps -ef | grep org.jboss | wc -l
> TIME: 09:56:04 THREADS: 100
> posselt in pingu (172) [0] >
>
>
> Grtngs,
> Dietmar
--
xxxxxxxxxxxxxxxxxxxxxxxx
Adrian Brock
Director of Support
Back Office
JBoss Group, LLC
xxxxxxxxxxxxxxxxxxxxxxxx
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